OptiDrop

Hash Generator Online — SHA-256 & SHA-512 Free

Generate SHA-256 and SHA-512 hashes instantly using the native SubtleCrypto API. Copy each hash, see hash length. No upload, no sign-up, 100% private.

SHA-256 256-bit
Hash will appear here...
Length: 0 hex characters
SHA-512 512-bit
Hash will appear here...
Length: 0 hex characters
Input characters: 0 Input bytes (UTF-8): 0

Free Online Hash Generator — SHA-256 & SHA-512

OptiDrop's Hash Generator creates SHA-256 and SHA-512 hashes from any text input using the browser's native SubtleCrypto API (window.crypto.subtle.digest). No external libraries are used. All hashing happens locally in your browser — nothing is sent to any server.

SHA-256 Hash

SHA-256 produces a 256-bit (32-byte) hash, displayed as 64 hexadecimal characters. It is part of the SHA-2 family designed by the NSA and is widely used in blockchain technology (Bitcoin), SSL certificates, file integrity checks, and digital signatures.

SHA-512 Hash

SHA-512 produces a 512-bit (64-byte) hash, displayed as 128 hexadecimal characters. It uses 64-bit operations which makes it faster than SHA-256 on 64-bit processors. SHA-512 is commonly used in TLS/SSL, Unix/Linux password hashing (as SHA-512crypt), and various security protocols.

Cryptographically Secure

The SubtleCrypto API provided by modern browsers is designed to be timing-safe and resistant to side-channel attacks. It provides the same quality of hashing as dedicated cryptographic libraries, making it suitable for security-sensitive applications.

Frequently Asked Questions

A hash is a fixed-size string of characters generated from input data using a mathematical algorithm. The same input always produces the same hash, but the hash cannot be reversed to get the original input. Hashes are used for data integrity verification, password storage, and digital signatures.
SHA-256 (Secure Hash Algorithm 256-bit) is widely used for: verifying file integrity (checksums), digital signatures, blockchain and cryptocurrency (Bitcoin uses SHA-256), password hashing (with salting), and SSL/TLS certificates. It produces a 256-bit (64 character) hexadecimal hash.
To hash a password, type it into the input field and click Generate. The tool produces SHA-256 and SHA-512 hashes. Note that for production password storage, you should always use a unique salt per password and a slow hashing algorithm like bcrypt or Argon2. Plain SHA hashes are too fast for secure password storage.
SHA-256 produces a 256-bit (64 hex character) hash, while SHA-512 produces a 512-bit (128 hex character) hash. SHA-512 is not necessarily more secure than SHA-256 for most purposes, but it is faster on 64-bit processors and provides a larger hash space. Both are part of the SHA-2 family and are considered cryptographically secure.

Last updated: June 2026